Research On Improving Design Of LC Filter For Active Power Filter

In recent years, a variety of power electronic devices increased widespread in electric power systems, industrial, transportation and family, mate pollution worsen for the public grid, and a variety of failures and accidents occurred by the harmonics. So harmonic is becoming an important issue for the power system. Theory for harmonic suppression and reactive power compensation had a lot of progress at home and abroad, so that LC passive filter used widely.Now LC passive filters which are used in china can not adapt to the gradual filtering of various new requirements. In this paper, it required this kinetic performance which of unit step response curve of Butterworth LC low-pass filter for a variety of industrial needs. The pole of Butterworth low-pass filter is re-distributed with Newton iteration, so that it changed unit step response curve of the filter. It could improve the design with genetic algorithms for some high-order LC filter. The contradiction is considered between the stability and response time, Butterworth low pass filter which is improved meet the various requirements of industrial indicators, and achieve the intended purpose. This has an important significance for LC low-pass filter.LC low-pass filter which was improved applied to the active filter device, mainly used to absorption circuit and filter out glitches. It would be used on absorption circuit, inhibiting peak voltage; LC low-pass filter which was improved could filter out glitches, so that high harmonics reduce the harm about the grid. As well as the application of LC low-pass filter would be simulated for Matlab, and verified the feasibility of applying about the LC low-pass filter.